Chapter 3 Statistical Models or Quality Control Improvement

Easy to find percentiles of the data; see page 43 Stem-and-Leaf Display

Also called a run chart Marginal plot produced by MINITAB Plot of Data in Time Order

Group values of the variable into bins, then count the number of observations that fall into each bin Plot frequency (or relative frequency) versus the values of the variable Histograms – Useful for large data sets

Histogram for discrete data

Numerical Summary of Data

The Box Plot (or Box-and-Whisker Plot)

Comparative Box Plots

The Hypergeometric Distribution

Basis is in Bernoulli trials The random variable x is the number of successes out of n Bernoulli trials with constant probability of success p on each trial The Binomial Distribution

Frequently used as a model for count data The Poisson Distribution

The Normal Distribution

Original normal distribution Standard normal distribution